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/*
* Copyright (C) 2012 Google Inc.
* Licensed to The Android Open Source Project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mail.ui;
import android.content.ContentResolver;
import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.AsyncTask;
import android.util.DisplayMetrics;
import com.android.ex.photo.util.Exif;
import com.android.ex.photo.util.ImageUtils;
import com.android.mail.providers.Attachment;
import com.android.mail.utils.LogTag;
import com.android.mail.utils.LogUtils;
import java.io.IOException;
import java.io.InputStream;
/**
* Performs the load of a thumbnail bitmap in a background
* {@link AsyncTask}. Available for use with any view that implements
* the {@link AttachmentBitmapHolder} interface.
*/
public class ThumbnailLoadTask extends AsyncTask<Uri, Void, Bitmap> {
private static final String LOG_TAG = LogTag.getLogTag();
private final AttachmentBitmapHolder mHolder;
private final int mWidth;
private final int mHeight;
public static void setupThumbnailPreview(AttachmentTile.AttachmentPreviewCache cache,
AttachmentBitmapHolder holder, Attachment attachment, Attachment prevAttachment) {
// Check cache first
if (cache != null) {
final Bitmap cached = cache.get(attachment);
if (cached != null) {
holder.setThumbnail(cached);
return;
}
}
final int width = holder.getThumbnailWidth();
final int height = holder.getThumbnailHeight();
if (attachment == null || width == 0 || height == 0
|| !ImageUtils.isImageMimeType(attachment.getContentType())) {
holder.setThumbnailToDefault();
return;
}
final Uri thumbnailUri = attachment.thumbnailUri;
final Uri contentUri = attachment.contentUri;
final Uri uri = attachment.getIdentifierUri();
final Uri prevUri = (prevAttachment == null) ? null : prevAttachment.getIdentifierUri();
// begin loading a thumbnail if this is an image and either the thumbnail or the original
// content is ready (and different from any existing image)
if ((thumbnailUri != null || contentUri != null)
&& (holder.bitmapSetToDefault() ||
prevUri == null || !uri.equals(prevUri))) {
final ThumbnailLoadTask task = new ThumbnailLoadTask(
holder, width, height);
task.execute(thumbnailUri, contentUri);
} else if (thumbnailUri == null && contentUri == null) {
// not an image, or no thumbnail exists. fall back to default.
// async image load must separately ensure the default appears upon load failure.
holder.setThumbnailToDefault();
}
}
public ThumbnailLoadTask(AttachmentBitmapHolder holder, int width, int height) {
mHolder = holder;
mWidth = width;
mHeight = height;
}
@Override
protected Bitmap doInBackground(Uri... params) {
Bitmap result = loadBitmap(params[0]);
if (result == null) {
result = loadBitmap(params[1]);
}
return result;
}
private Bitmap loadBitmap(final Uri thumbnailUri) {
if (thumbnailUri == null) {
LogUtils.e(LOG_TAG, "Attempting to load bitmap for null uri");
return null;
}
final int orientation = getOrientation(thumbnailUri);
AssetFileDescriptor fd = null;
try {
fd = mHolder.getResolver().openAssetFileDescriptor(thumbnailUri, "r");
if (isCancelled() || fd == null) {
return null;
}
final BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
opts.inDensity = DisplayMetrics.DENSITY_LOW;
BitmapFactory.decodeFileDescriptor(fd.getFileDescriptor(), null, opts);
if (isCancelled() || opts.outWidth == -1 || opts.outHeight == -1) {
return null;
}
opts.inJustDecodeBounds = false;
// Shrink both X and Y (but do not over-shrink)
// and pick the least affected dimension to ensure the thumbnail is fillable
// (i.e. ScaleType.CENTER_CROP)
final int wDivider = Math.max(opts.outWidth / mWidth, 1);
final int hDivider = Math.max(opts.outHeight / mHeight, 1);
opts.inSampleSize = Math.min(wDivider, hDivider);
LogUtils.d(LOG_TAG, "in background, src w/h=%d/%d dst w/h=%d/%d, divider=%d",
opts.outWidth, opts.outHeight, mWidth, mHeight, opts.inSampleSize);
final Bitmap originalBitmap = BitmapFactory.decodeFileDescriptor(
fd.getFileDescriptor(), null, opts);
if (originalBitmap != null && orientation != 0) {
final Matrix matrix = new Matrix();
matrix.postRotate(orientation);
return Bitmap.createBitmap(originalBitmap, 0, 0, originalBitmap.getWidth(),
originalBitmap.getHeight(), matrix, true);
}
return originalBitmap;
} catch (Throwable t) {
LogUtils.i(LOG_TAG, "Unable to decode thumbnail %s: %s %s", thumbnailUri,
t.getClass(), t.getMessage());
} finally {
if (fd != null) {
try {
fd.close();
} catch (IOException e) {
LogUtils.e(LOG_TAG, e, "");
}
}
}
return null;
}
private int getOrientation(final Uri thumbnailUri) {
if (thumbnailUri == null) {
return 0;
}
InputStream in = null;
try {
final ContentResolver resolver = mHolder.getResolver();
in = resolver.openInputStream(thumbnailUri);
return Exif.getOrientation(in, -1);
} catch (Throwable t) {
LogUtils.i(LOG_TAG, "Unable to get orientation of thumbnail %s: %s %s", thumbnailUri,
t.getClass(), t.getMessage());
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
LogUtils.e(LOG_TAG, e, "error attemtping to close input stream");
}
}
}
return 0;
}
@Override
protected void onPostExecute(Bitmap result) {
if (result == null) {
LogUtils.d(LOG_TAG, "back in UI thread, decode failed or file does not exist");
mHolder.thumbnailLoadFailed();
return;
}
LogUtils.d(LOG_TAG, "back in UI thread, decode success, w/h=%d/%d", result.getWidth(),
result.getHeight());
mHolder.setThumbnail(result);
}
}
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